Differential pressure is the difference in pressure between two points in a fluid system. It's a crucial measurement in various applications, including HVAC systems, industrial processes, and medical devices. Differential pressure can indicate flow rate, liquid level, or filter condition.

The formula for differential pressure is:

\[ \Delta P = P_1 - P_2 \]

Where:

- \( \Delta P \) is the differential pressure
- \( P_1 \) is the pressure at point 1
- \( P_2 \) is the pressure at point 2

Let's calculate the differential pressure between two points:

- Given:
- Pressure at point 1 (\( P_1 \)) = 150 kPa
- Pressure at point 2 (\( P_2 \)) = 100 kPa

- Apply the differential pressure formula: \[ \Delta P = P_1 - P_2 \]
- Substitute the known values: \[ \Delta P = 150 \text{ kPa} - 100 \text{ kPa} \]
- Perform the calculation: \[ \Delta P = 50 \text{ kPa} \]

Let's visualize differential pressure in a simple system:

This diagram illustrates:

- Two pressure points (P₁ and P₂) in a system
- The higher pressure at P₁ (150 kPa)
- The lower pressure at P₂ (100 kPa)
- The differential pressure (ΔP) between the two points (50 kPa)
- The direction of potential flow from high to low pressure

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